Deuteronomy 25:5–6

PRESERVING THE FAMILY LINE

5 “When brothers live on the same propertyA and one of them dies without a son, the wife of the dead man may not marry a stranger outside the family. Her brother-in-law is to take her as his wife, have sexual relations with her, and perform the duty of a brother-in-law for her. 6 The first son she bears will carry on the name of the dead brother, so his name will not be blotted out from Israel.k